


PROBLEMS AND QUESTIONS 


IN 


General Chemistry | 


ARRANGED FOR 


THE USES OF STUDENTS 


IN THE 


Chemical Laboratory 


OF THE 


UNIVERSITY OF ILLINOIS 


BY 


CLARENCE W. BALKE 


SECOND EDITION 


Published by the 
U. of I. Supply Store 
Champaign, Ill. 
1911 








Winiversity of 
iinois Library 
al Urbana-Champaign 
Oak Street 


ny ’ t We, 


— ie 


*._f. 


BlVMee 


: 
% 


INTERNATIONAL ATOMIC WEIGHTS, 1911. 


Symbol. 
Aluminium........ Al 
ADUMONY. .....- Sb 
EEO on otatw ais Ss A 
A TRETLICS po es eos As 
PRRR TEER ee. S08. x on Ba 
iS Tk A Bi 
OS B 
Bromine: ..5..... Br 
PPA WM oy ssc 30 Cd 
0 ere Cs 
NAITYAS 5 os ao Ca 
BeeaTDON. 2 ss 0. Cc 
MOET sic ss ws Ce 
PTUOPING. ses. Cl 
ORPONIUM.....% . Cr 
DOANE .0.23 ek > os Co 
Columbium...... Cb 
Gper.. svc... Cu 
os Dysprosium..... Dy 
ag MERRURULE ceva pee. 6 « Er 
Ni PUTOpIUM ... 6... Ku 
= ee PiMOTING. . 0... KF 
= Gadolinium...... Gd 
= Gallium......... Ga 
= Germanium..... Ge 
PeUUCERIIN 5. cc ees Gl 
Eine fia oe unl es Au 
BEIT si 5.5s0-h 0 <i He 
Pea ew Hydrogen....... H 
% MBER IND Scat Sate» In 
BEVOIIIG «5 ote 5 c-viele s I 
LJ SPAOLIIN e S 405s Ss, « iby 
1) Se ee Fe 
ie) re Kr 
~ Lanthanum...... La 
Faas a Pb 
> Beier... 3. %... Li 
> HeULeCIUM. =. 4... Lu 
] Maznesium..... Mg 
i Manganese..... Mn 
J Mercury... .\<.. Hg 





Atomic 
weight 


27.1 


120.2 


39.88 
74.96 
137.37 
208.0 
11.0 
79.92 
112.40 
132.81 
40.09 
12.00 
140.25 
35.46 
52.0 
58.97 
93.5 
63.57 
162.5 
167.4 
152.0 
19.0 
157.3 
69.9 
72.5 
vet 
197.2 
3.99 
1.008 
114.8 
126.92 
193.1 
55.85 
82.92 
139.0 
207.10 
6.94 
174.0 
24.32 
54.93 
200.0 


ioe) 


Symbol. 
Molybdenum.... Mo 
Neodymium..... Nd 
INGOT AE orrak tas Ne 
INICKGL: Gites sat Ni 
Nitrogen. o.7.. 6. N— 
CSM ae en ate Os 
Gereen es As uae. Oz 
Palladium....... Pd 
Phosphorus...... jie 
Platinum .wi.%. . Pt 
Potassitim <2. 2 1 ae 
Praseodymium... Pr 
Radium. j24.%: Ra 
NOG te oes Rh 
Rubidium: .24..- Rb 
Ruthenium...... Ru 
SAMArLUMh. 2... Sa 
Seandiums. <3... Sc 
Selenium yi .05%.. < Se 
PLLICOM yc erste toes Si 
Siiveteens tas cde Ag 
SOOM ua. eis Na 
Strenuum tian at sr 
STi bONUh. an ete. a Sco 
Tanteium: «ic. Ta 
Tellurium....... Te 
AA DU Ue Cg tee Tb 
THeMMMs war or lh 
AS LQTBILTEL « sivceccterava Th 
POMHUM: ws feces Tm 
PATE Gt sa ae Sn 
PELEA TAI vais ch .a é hy 
AUINSSten Ss. se... W 
SEP OTN. GP hecs 28 U 
WETIAG PUI ot. oes V 
EPR TIVOLI ths cd So spied ae 
Ytterbium 

(Neoytterbium) Yb 
SY LED TUT soe cysts sts YY. 
VARI T at SNS ye Zn 
AITCORIMNY 3 aa. Zr 


Atomic 
weight 
96.0 
144.3 
20.2 
58.68 
14.01 
190.9 
16.00 
106.7 
31.04 
19552 
39.10 
140.6 
226.4 
102.9 
85.45 
101.7 
150.4 
44.1 
79.2 
28.3 
107.88 
23.00 
87.63 
32.07 
181.0 
Lhe 
159.2 
204.0 
232.4 
168.5 
119.0 
48.1 
184.0 
238.5 
51.06 
130.2 


172.0 
89.0 
65.37 
90.6 






































































































































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TENSION OF AQUEOUS VAPOR IN MILLIMETERS. 


oe 





_ 


Temperature |Tension|| Temperature |Tension|| Temperature | Tension 








33°C. 37.4 


0°. 4.6 17°C. 14.4 

1 4.9 18 15.4 34 39.6 
2 5.3 19 16.4 35 41.9 
3 BE. 20 17.4 40 55 0 
4 6.1 21 18.5 45 71.5 
5 6.5 22 19.7 50 92.2 
6 7.0 23 20.9 55 117.8 
7 7.5 24 22.9 60 149.9 
8 8.0 25 93.5 65 187.5 
9 8.6 26 | 95.0 70 933.8 
10 9.2 27 26.5 15 289.3 
11 9.8 28 28-4 80 355.5 
12 10.5 29 29.8 85 433.8 
13 11.2 30 31.6 90 526.0 
14 11.9 31 33.4 95 634.0 
15 12.7 32 354 100 760.0 
16 13.6 


| 
WEIGHT OF ONE LITER OF GAS AT 0° AND 760 MM. PRESSURE. 





Substance Formula Weight of 1 Liter. 
Acetylene CoH. 1.162 
Ammonia NH, 0.762 
Argon A 1.782 
Arsine AsH, 3.485 
Bromine Br, 7.143 
Carbon dioxide | co, 1.965 
Carbon monoxide CO b heat 
Chlorine Cols 3.167 
Ethane C.H, 1.342 
Ethylene CoH, 1,252 
Fluorine i's L097 
Hydrogen H, 0.0899 
Hydrogen bromide HBr 3.616 
Hydrogen chloride HCl 1.628 
Hydrogen fluoride HF 0.894 
Hydrogen iodide HI Oe § 
Hydrogen sulphide H.S 1.523 
Methane CH, 0.716 
Nitric oxide NO 1.342 
N:trogen ; N., 1.254 
Nitrogen dioxide NO, 2.056 
Nitrous oxide N,O 1.969 
Oxygen O, 1.429 
Phosphine BE: 1.520 
Silicon tetrafluoride SiF, 4.663 
Sulvhur dioxide so, 2.861 


Note :—Use 35.5 as the atomic weight of chlorine and 
the nearest whole number in the case of the other elements, 
use 0.09 gram as the weight of one liter of hydrogen, and 
consider all conditions standard unless otherwise stated. 

1. A stream of oxygen was passed over 1.07 grams of 
heated magnesium and 1.78 grams of the oxide were ob- 
tained. Calculate the combining weight of the metal. 


2.. The combining weight of chlorine is 35.5. With 
what weight of chlorine will 40 grams of magnesium com- 
bine? 

3. Irom the following data calculate the combining 
weight of copper :— 


Weight of boat empty..02s5 ea 11.782 
Weight of boat + copper........ 12.128 


Weight of boat + copper oxide. ..12.215 


4." A flask weighs 17.642 grams in air. Its weight 
full of water is 86.726 grams, and when filled with sul- 
phurie acid the w ea is 52.183 grams. Calculate the spe- 
cific gravity of the acid. If an error of one gram were 
mnade in the last weighing, what would be the per cent. 
error in the result? 

». Two grams of sulphur were burned in oxygen giy- 
ing 4 grams of an oxide. Calculate the formula of the lat- 
Ler: 

6. Four grams of a compound of copper and chlorine 
were found to contain 2.56 grams of copper. What is the 
formula of the compound? 


¢. From their percentage compositions find the form- 
ulae of the following substances :— 


if Il. TE 
MWigae sh Rees te 72.41 Sodium.... 17.56 Water H,O 55.90 
Oxygen.... 27.59 Chronium.. 39.69 Oxygen... 19.87 
Oxygen.... 42.75 Sulphurs.9 eee 
Sodium... 14.28 


8. Find the percentage composition of substances 
having the following formule: Zn SO,, P.O;, H.RO,. 

9. What weight of sulphur will combine with 0.7 
gram of mercury? 


10. If 1 gram of sulphur and 5 grams of mercury are 
rubbed together in a mortar, a portion of which element re- 
mains uncombined and in what amount? 


11. What weight of silver can be obtained from 40 
erams of an ore having the formula Ag,AsS,? 


12. Will 22 grams of mercuric oxide give more or 
less oxygen than 12 grams of potassium chlorate? 


138. How much mercuric oxide is required for the 
preparation of 40 liters of oxygen? 


14. What weight of potassium chlorate will be re- 
quired to give 20 grams of oxygen. 


15. What weight of oxygen can be obtained from 1.2 
grams of potassium chlorate? 


16. What weight of mercury will result on the de- 
composition of 30 grams of mercuric oxide? 

17. What weight of potassium chloride can be ob- 
tuined by the ignition of 4 grams of potassium chlorate? 


18. When MnO, is ignited to a high temperature it 
gives oxygen and Mn,O,. What weight of oxygen can be 
obtained from 5 grams of manganese dioxide? 

19. In the case of the two oxides of manganese, MnO, 
and Mn.O,, determine the weight of oxygen combined with 
one gram of manganese in each compound. What simple 
‘atio do the two amounts of oxygen bear to each other? 
What law does this illustrate? 

20. Two grams of iron were burned in oxygen, giv- 
ine 2.762 grams of an oxide. Find the formula of the 
latter. 


“NI 


21. How many calories of heat are liberated in the 
combustion of 36 grams of carbon? 


When 3 grams of phosphorus are burned in oxygen 
17,800 calories of heat are liberated. Calculate the heat of 
combustion of phosphorus. 


23. The specific heat of lead is 0.031. How many cal- 
ories of heat are required to raise the temperature of 200 
erams of lead from 18° to 42°? 


24. Jf 100 grams of granulated zinc having a specific 
heat of 0.093 are poured into 100 ce. of water at 20° and 
the temperature of the mixture is 26°, what was the orig- 
inal temperature of the zinc? 

25. 274 cc. of gas measured at 0° would have what 
volume at 37°, the pressure remaining constant? 

26. Reduce 100 ce. of gas at 19° to 59°, pressure re- 
maining constant. 

27. Reduce 55 cc. of gas at 37° to —T7°, pressure re- 
maining constant. 

28. Reduce 640 cc. of gas from 760 mm. to 700 mm., 
the temperature remaining constant. 


29. Reduce 250 ce. of gas at 300 mm. to 1800 mm., 
the temperature remaining constant. 


30. Reduce 140 ce. of gas at 21° and 200 mm. to 42° 
and 300 mm. 

31. Reduce 600 ce. of gas at —20° and 400 mm. to 
—10° and 200 mm. 

32. Reduce 200 ce. ofdry gas at 20° and 760 mm. to 
0° and 760 mm. 

33. Reduce 300 ce. of gas at 17° and 760 mm. to 45° 
and 760 mm., the gas being completely saturated with wa- 


ter yapor under both conditions. 
8 


34. A sample of gas at 20° and 730 mm. is maintain- 
ed at a constant volume, but the temperature is raised to 
deo. ind the pressure. 

.385. What volume will 400 cc. of dry gas at 20° and 
740 mm. occupy at 30° and 800 mm. if completely satur- 
ated with water vapor? 

36. What will be the weight of 20 liters of oxygen at 
13° and 420 mm. if the gas is one-half saturated with water 
vapor? 

37. What volume of dry oxygen at 16° and 560 mm. 
will be required to combine with 50 grams of phosphorus? 


38. What is the weight of one liter of air at 25° and 
640 mm.? 


39. <A sample of gas contained in a eudiometer tube 
over mercury measures 51 cec., while the mercury within 
the tube stands 67 mm. above that on the outside. <A bar- 
ometer shows an atmospheric pressure of 749 mm. Re- 
duce the volume of gas to standard pressure. 


4). What volume of oxygen (measured over water) 
at 22°, and 700 mm. will be furnished by 80 grams of po- 
tassium chlorate? 


41. At what pressure will one liter of oxygen weigh 
1.69 grams at —3°? 


42, What would be the weight of 473 ce. of air at 
21° and420 mm.? 
| 43. What volume would 1.2 grams of oxygen occupy 
at —20° and 800 mm.? 

44, A bulb having a capacity of 340 cc. weighs 27.623 
erams when full of air at 21° and 745 mm. When filled 
with a gas mixture under the same conditions it weighs 
28.762 erams. Find the weight of one liter of the gas mix- 
ture under standard conditions. 

“9 


45. 150 ce. of gas at 18° and 600 mm. is maintained 
at constant volume and the temperature is raised to 52°. 
What pressure will the gas exert at the new temperature? 


46. A sample of gas in a tube measures 58.4 ce. when 
the inner level of the mercury is 21 cm. above the outer 
level and the temperature is 16°. What will be the vol- 
ume of the gas if the tube is lowered into the mereury to 
such an extent that the inner level is 5 cm. below the outer 
level and the temperature has changed to 21°? The bar- 


rv ie 6) 


ometric reading 1s 752 mm. 


47. What weight of hydrogen will be given off by the 
action of sulphuric acid on 7 grams of zinc? 


L 48. What weight of hydrogen will be evolved by the 
action of sodium on 3 grams of water? What weight of 
sodium hydroxide will result? 

pe 49. What weight of zinc must be used in the prepara- 
tion of 70 liters of hydrogen? 

50. What volume of hydrogen will result from the 
action of hydrochloric acid on 15 grams of magnesium? 


ol. What volume of hydrogen will result from the 
action of 11 grams of sodium on water? 


D2. Steam is passed over heated iron until 41 grams 
of the magnetic oxide have been formed. What volume of 
hydrogen is liberated? 

53. What volume of oxygen at 21° and 740 mm. will 
unite with 60 grams of hydrogen? 

D4. What volume of hydrogen at 0° and 420 mm. will 
result from the electrolysis of 1.5 grams of water? 

o). What weight of copper oxide will be reduced by 
20 grains of hydrogen? 

96. Hydrogen is pased through a hot tube contain- 
ing copper oxide. If the latter looses 2.36 grams in weight, 

1@@) 


What volume of hydrogen has united with the oxygen of 


the copper oxide? What weight of metallic copper has 
been produced? -" 

57. How many calories are required to change 9 
erams of ice at 0° into steam at 100°? 

58. Calling the heat of combustion of hydrogen 34,- 
500 calories, compare the amounts of hydrogen and car- 
bon required to melt 20 grams of ice, assuming that all the 
heat is used. 


59. What weights of nitric acid and of magnesium 
chloride, respectively, are contained in 1 liter of a normal 
solution? A molar solution? 


60. <A solution contains 120 grams of phosphoric acid 
per liter. Calculate the concentration in terms of a nor- 
mal solution. ° 


61. A 11 per cent. solution of sodium carbonate has 
a specific gravity of 1.118. Calculate the concentration in 
terms of a molar solution. 


62. What is the molar concentfation of a saturated 
solution of hydrogen in water if the®gas is supplied under 
standard pressure? If supplied under a presure of 400 
mm. ? 

63. Look up the solubilities of oxygen and hydrogen 
and calculate what volume of each gas dissolves in 38 
liters of water at 14° over which is passed a stream of a 
gas mixture under 5 atmospheres pressure and containing 
20 per cent. oxygen and 80 per cent. hydrogen by volume. 

64. What weight of phosphoric acid, H.PO, will be 
required to make 38.2 liters of a 20 per cent. solution (sp. 
or,, 1.12)? Express the concentration in terms of. a 
normal solution. 

65. A 36 per cent. solution of MgCl, has a sp. gr. of 
1.2425. Express the concentration of the solution in terms 
of a normal solution. 

DT 


> 


° 










L- 66. How 1 
tained in 2 kilogra4 
<L- Of. ‘It is found tith0s am - aluminium yields 
44.1 ce. of hydrogen at 20° ‘and :740 gm. when measured 
over; water, Calculate the combining wékght of the metal. 
tL 68. The density of liquid hydrogen ‘ is: 0.07. Find the 
weight of 18 ec. and. a a it would. bt as a gas at 
20° and 720 mm. =3"" 
b& 69. What weight of manganese dioxide ‘would be re- 
quired for the preparation of 17 grams of chlorine from 
the action of hydrochloric acid on the oxide® 
weight of chlorine would result from the 
chloride and sulphuric acid on 11 grams 
ganes cide? 
Wht volume of chlorine can be obtained by 
‘ hydrochloric acid with 40 grams of manganese 


is sodium sulphate is con- 
BN lized salt? 









— What v 
ing the preparatio 

73. Weph wha ight of potassium permanganate 
will 100 grams of hydrochloric acid react? 







ume of hydrogen will be liberated dur- 
erans of chlorine by electrolysis? 


74. How many grams of chlorine will dissolve ince 


liters of water at 20°? pies: 
‘6 75. What volume of chlorine will combine with 60 
~ grams of sodium? n 


76. What weight of MnCl, is produced during the 
preparation of 10 liters of chlorine from manganese diox- 
ide and hydrochloric acid? 


a 


_ 77. What volume of chlorine will dissolve in 20 
liters of water if shaken with the gas under a pressufe of 
950 mm.? ee 

e : rp? > 
(8. What volume of hydrogen chloride will result 
from burning 35.45 grams of chlorine in hydrogen? 
12 : 





p> é° 

79. Whét weight and volume of hydrogen chloride 
can be prepared from 350 grams of sodium chloride? 

80. What weight of hydrogen chloride is contained in 
650 cc. of a tenth normal solution? 


2 81. What volume of hydrogen chloride 194.540. 
passed into 99 grams of water in of tne make vet 5 a erams 


of a 1 per cent. solution? o¢tan rebar 13 ie! 
£ 2. A solution of hydrogen chloride having 13.65 


-eravity of 1.2 contains 39.11 per cent. by weight of the gas. 
What volume of the dry gas at 10° and 700 mm. will be 
required to make 7 liters of such a solution? 


£ 83. What volume of a 10 per cent. solution (sp. gr. 


C9 wick 
wah of 
ey 


=1.05) of hydrochloric acid will be required to dissolve 6 - 


erams of magnesium? 


84. Calculate the weight of one liter of a gas having 
the formula C,H... 


85. The weight of one liter of a gas is 1.97 grams. 
What is the molecular weight of the substance? 


8&6. Calculate the weight of one liter of a gas having 
the formula AsH,. 

87. What is the weight of 3 liters of bromine vapor 
at 69° and 400 mm.? 

88. The molecular weight of a substance is 271. 
What is the weigth of 1. liter of the gas at 275° and 760 
mm. ? 

89. The chloride of a metal contains 25.26 per cent. 
of the metal and 74.74 per cent. of chlorine. The specific 
heat of the metal is 0.250. What is its valence and atomic 
weight? 

90. . The molecular weight of a substance is 78. What 
is the weight of one liter, and what is its density referred 
to air and to hydrogen? 

13 


 ® 


91. The density of a substance referred to air is 
0.968. An analysis of 3.26 grams gave 2.79 grams of car- 
bon and 0.47 gram of hydrogen. What is the formula of 
the substance? 


*92.. A compound contains one gram of hydrogen for 
every twelve grams of carbon and has a molecular weight 
of 78. What is its formula? 


93. “PHeNPecitfic heat of a metal is 0.112. 1.625 grams 
of its chloride contains 0.560 gram of the metal. What is 
the atomic weight of the metal and what is the formula of 
the chloride? 


94. If the atomic weight of oxygen was placed at 75, 
what would be the G. M. V.?) What would be the atomic 
weight of bromine? | 


95. What weight of bromine would result from the 
action of sulphuric acid and manganese dioxide on 8.3 
erams of potassium bromide? If the bromine were all con- 
densed and collected as a liquid what volume would it 
occupy? 


96. What volume of dry bromine calculated as va- 
por under standard conditions will be liberated from a so- 
lution of potassium bromide by 23 grams of chlorine? 

97. What volume of vapor at 200° and 760 mm. will 
be produced by 7 cc. of liquid bromine? 

98. What weight of phosphorus acid is produced 
when 140 grams of hydrogen bromide is prepared by the 
action of bromine on moist phosphorus? 

99. What weight of water will react with 11 grams 
of phosphorus triiodide? What volume of hydrogen io- 
dide will result from such action? 

100. What weight and volume of hydrogen iodide 
will be required to make 75 grams of the constant boiling 
solution ? 


14 


101.. Calculate the percentage of fluorine in the min- 
erals fluorite and cryvolite. 


102. How much sulphuric acid will be required to 
decompose 50 grams of fluorite? What volume of gas at 
43° and- 750 mm. will result? 


1038. What volume of chlorine will react with 15 
grams of potassinin hydroxide in solution? 


104. When chlorine is passed into a dilute solution 
of potassium hydroxide, what volume of the gas will be 
used in the preparation of 40 grams of potassium hypo- 
chlorite? 


L105.) What amount of potassium hypochlorite will be 
decomposed by 20 grams of a 30 per cent. hydrochloric 
acid solution? 


2.106. What volume of oxygen will result through the 
decomposition of 30 grams of hypochlorous acid? 


107. What weight of sodium hydroxide will be neu- 
tralized by 20 grams of hypochlorous acid? 


108. In the preparation of potassium hypobromite, 
what volume of liquid bromine should be added to a solu- 
tion containing 100 grains of potassium hydroxide? 

109. What volume as ozone would 9 grams of oxy- 
ven occupy ? . 

110. What amount of potassium iodide will be oxi- 
dized by 3 grams of ozone? 

111. What volume of ozone will 50 cc. of water dis- 
solve froin a gas mixture containing 2.7 per cent. of ozone? 

112. What amount of sodium peroxide and hydro- 
chlorie acid must be used to produce 480 grams of a 3 per 
cent. solution of hydrogen peroxide? 

113. What volume of carbon dioxide will be ab- 
sorbed if passed into water in which 25 grams of barium 
peroxide is suspended? 

15 


* 
4114. What relative volume of oxygen can be obtain- 
ed from a 8 per cent. solution of hydrogen peroxide? 


115. Define unit molecular concentration. What is 
the molecular concentration of a solution containing 70 
erams of sodium chloride in 6 liters. 


116. What is the molecular concentration of the 
aqueous vapor above water at 14° and at 35°? 


117. A gas mixture contains 25 per cent. of oxygen 
and 75 per cent. of nitrogen by volume and the mixture is 
under. a pressure of 9 atmospheres. Calculate the mole- 
cular concentration of each of the gases, 


118. What is the molecular concentration of oxygen 
if nnder a pressure of 890 mm.? 


119. Under what conditicns will any gas have unit 
molecular concentration ? 


120. What weight of potassium permanganate will 
be reduced by 7 grams of hydrogen peroxide? 


121. What amount of hydrogen peroxide will be re- 
quired to reduce 2 grams of potassium dichromate? 


122. What weight of sodium hydroxide would be 
neutralized by 100 ce. of a solution of sulphuric acid, 


p7 e) 


density 1.20 and containing 27.3 per cent. of the pure acid? 


128. What weight of crystallized sodium carbonate 
will be neutralized by 400 ce. of a normal solution of hy- 
drochloric acid? What volume of gas will be liberated? 


124. What weight of silver will be deposited by a 
current of electricity which liberates 200 cc. of hydrogen? 

125. What weight of mercury will be thrown out of 
a solution of mercurous nitrate by 2 grams of copper? 


126. What weight of lead will be thrown out of. a so- 
lution by 9 erams of zinc? 
16 


127. What weight of sodium carbonate will be re- 
quired to neutralize 40 grams of sulphuric acid? 


128. Tow much aluminum will be dissolved by 90 ce. 
of a solution of hydrochloric acid, one ee. of which will 
neutralize 1.31 cc. of a normal sodium hydroxide solution? 


129. What weight of hydrogen sulphide would re- 
sult from the action of sulphuric acid on 18 grams of zine 
sulphide? 


130. What weieht of hydriodic acid will be oxidized 


— 


to iodine in producing 7 grams of hydrogen sulphide? 


131. What volume of hydrogen sulphide will result 
from the action of hydrochloric acid on 200 grams of fer- 
rous sulphide? 


132. What volume of oxygen will be used in the com- 
bustion of 4 grams of sulphur? What will be the volume 
of sulphur dioxide formed? 


133. What weight of stibnite, Sb.S., must be treated 
with hydrochloric acid to produce 63 ce. of hydrogen sul- 
plide at —8° and 740 min.? 


134. What amount of potassium dichromate will be 
reduced by 92 grams of hydrogen sulphide? 





135. What volume of hydrogen sulphide will be re- 
quired to precipitate all the lead from a solution contain- 
ing 380 erams of lead nitarate? 

136. What volume of hydrogen sulphide will dis- 


solve in 200 ce. of water if the gas is under a pressure of 
960 mm.? 


137. What volume of oxygen at 20° and 745 mm. will 
be used up in the combustion of 500 grams of pyrite? 
18s. What weight of sulphuric acid will be required 
to decompose 50 grams of sodium sulphite? 
. £7 


139. How much copper must be heated with sul- 


phurie acid to produce 96 ce. of sulphur dioxide? 


140. With what volume of oxygen will 90 liters of | 


sulphur dioxide combine in the preparation of sulphur tri- 
oxide by the contact process? 


141. How much Glauber’s salt, Na,SO,, 10H, O, can 
be prepared from 900 grams of sodium chloride? 


142, How much sodium thiosulphate can be pre- 
pared from 100 grams of sodium sulphite? 


143. What volume .of nitrogen at 17° and 765 mm. 
(measured over water) can be obtained from 20 grams of 
ammonium nitrite? 

144. How much ammonium sulphate must be used in 
the preparation of 40 liters of dry ammonia at —8° and 
860 mm.? 


145. Tfow much nitric acid will react with 1000 ce. 
of a solution containing 15 per cent. of ammonia and hay- 
ing a specific gravity of 0.942? 


146. How much nitric acid can be obtained from 60 
erams of magnesium nitrate? 


147. With what weight of ferrous chloride will 2 
erams of nitric acid react? 


148. What volume of nitric oxide will be produced 
when 50 grams of copper are disolved in nitric acid, as- 
suming that no other gas is formed? 


149. -With what volume of oxygen will 8 liters of 
nitric oxide unite in forming the dioxide? 
150. How much ammonium nitrate will result when 
very dilute nitric acid reacts with 10 grams of zinc? 
151. Calculate the percentage of phosphorus in the 
mineral apatite, Ca,F(PO,) ». 
18 


152. How much potassium hydroxide and how much 
phosphorus are required to make 1.2 grams of phosphine 
by the interaction of the two substances? What volume 
would this amount of phosphine occupy under standard 
conditions? 

153. What is the relative percentage of phosphorus 
in magnesium ammonium phosphate and magnesium pyro- 
phosphate? 

154. With what volume of oxygen at 32° and 742 
mim. will 4 grams of carbon combine to form carbon di- 
oxide? 

155. What volume of air is needed for the combus- 
tion of 600 pounds of carbon? 


156. What weight of marble must be treated with an 
acid to produce 15 liters of carbon dioxide at 4° and 600 
mm. if saturated with water vapor? 


157. The specific gravity of liquid carbon dioxide at 
0° is 0.95. What volume would 9 ce. of this liquid occupy 
as a gas at —30° and 3 atmospheres pressure? 


158. What volume of carbon dioxide will dissolve in 
700 ce. of water if the gas is supplied under a pressure of 
2.3 atmospheres? 

159. What volume of carbon dioxide and what vol- 
ume of water vapor, both measured at 110° and 760 mm., 
will result from the ignition of 45 grams of sodium bicar- 
bonate? ; 

160. What are the relative volumes of carbon diox- 
ide and carbon monoxide resulting from the ignition of 
oxalic acid? 

161. What volume of methane will result from the 
ignition of 20 grams of sodium acetate with sodium hy- 
droxide? » 

162. What volume of ethylene can be produced from 
20 grams of alcohol? 

19 


LANL 
3 77681119 


01120 


163. How much calcium carbide must be used to pro- 
duce 45 liters of acetylene if the former is only 67 per cent. 
pure? — 

164.What volume of carbon dipside will escape dur- 
ing the fermentation of 50 grams of cane-sugar? 
| 165. Compare the volumes of oxygen required for 
the complete combustion of 10 grams each of methane, 

ethylene, and acetylene. 

166. What volume of air will eunicl the oxygen re- 
quired for the combustion of 60 grams of acetylene? 

167. What weight of glycerine is produced during 
the saponification of 600 grams tripalmitin? 

168. What volume of oxygen is used up in convert- 
ing 70 grams of alcohol into acetic acid? 

169. What weight of silicon dioxide can be reduced 
by 40 grams of magnesium? ? 

170. What volume of silicon hydride can be pre- 
pared from 20 grams of magnesium silicide? 

171. What weight of hydrofluosilicic acid can be pre- 
pared from 10 liters of silicon tetrafluoride? 

172. What weight of baruim chloride will react with 
4 grams of hydrofluosilicie acid? 

173. Calculate the percentage composition of the 
mineral colemanite. 

174. What weight of boron is contained in 45 liters — 
of boron trifluoride? | 

175. What weight of boric acid can be prepared 
from 60 grams of crystalized borax? 

176. If gunpowder explodes according to the reaction 

2KNO,+8C-+S =—K,S+-38C0,--N,, 
calculate what volume of gas would result from the igni- 
tion of one pound of the material. : 

177. How much sodium carbonate can be made by 
the LeBlane process from 6 tons of sodium chloride and 
20 tons of coal? 

20 





